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Configuring IP Services
8-26
303528-A Rev 00
Enabling and Disabling Black Hole Punching
If BGP advertises aggregate routes, you can configure BGP to submit each
aggregate route to the routing table as a black hole. If IP receives a packet that
does not match any of the explicit subnet routes, the black hole route causes it to
discard the packet. (For more information about black hole routes, see “Defining a
Static Black Hole for a Supernet” on page 4-60.)
By default, BGP does not submit a black hole route to the IP routing table for an
aggregate route that it advertises to a BGP peer.
You can use the BCC to enable this feature. You can also configure IP to return an
ICMP destination unreachable message to the sender of a packet to an unknown
destination.
Navigate to the BGP prompt and enter:
black-hole-punching
action
action is one of the values described in Table 8-5.
For example, the following command line causes BGP to submit aggregate routes
to the routing table as black hole routes IP drops packets for unknown destinations
but does not return ICMP destination unreachable messages to the sender:
/jointfilesconvert/92449/bgp# black-hole-punching drop
/jointfilesconvert/92449/bgp#
Table 8-5. Black Hole Punching Parameter Settings
Value Meaning
disabled (default) Disables black hole punching
drop Enables black hole punching. IP drops packets for an unknown
destination without returning an ICMP message to the sender.
reject Enables black hole punching. IP drops packets for an unknown
destination and returns a destination unreachable message to
the sender.
- Configuring IP Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 303528-A Rev 00 10
- Before You Begin 23
- Text Conventions 24
- Acronyms 25
- How to Get Help 27
- Chapter 1 29
- IP Addresses 30
- Subnet Addressing 32
- Supernet Addressing 35
- Autonomous Systems 36
- Border Gateway Protocol (BGP) 38
- Router Discovery Protocol 39
- Route Preferences 40
- Route Weights 41
- Figure 1-3. IP Routing Table 43
- IP Traffic Filters 46
- RFC Compliance 46
- Chapter 2 49
- Starting IP 50
- Starting RIP 51
- Starting OSPF 52
- Starting BGP 53
- Starting Router Discovery 54
- Chapter 3 55
- Deleting IP from an Interface 57
- Customizing IP 57
- Adding RIP to an IP Interface 59
- Customizing RIP 60
- Customizing OSPF 62
- Deleting BGP from the Router 64
- Customizing BGP 65
- Starting EGP 66
- Deleting EGP from the Router 67
- Customizing EGP 67
- Starting NAT 68
- Chapter 4 77
- The IP global prompt appears 79
- (continued) 85
- Caution: 100
- Customizing an IP Interface 102
- Using the BCC 108
- Using Site Manager 108
- IP0012A 121
- Configuring an SMDS Address 123
- Defining a Static Route 132
- Choosing a Broadcast Type 138
- Chapter 5 141
- ARP Overview 142
- Figure 5-2. Proxy ARP Example 149
- Chapter 6 153
- Customizing RIP Services 153
- Setting the RIP Diameter 154
- Customizing a RIP Interface 156
- Selecting the RIP Version 160
- Specifying the Update Mode 163
- Sending Triggered Updates 164
- Listening for a Default Route 173
- Chapter 7 195
- Customizing OSPF Services 195
- OSPF Concepts and Terminology 196
- OSPF Neighbors 197
- Neighbor Adjacencies 198
- Designated Routers 198
- OSPF Areas 199
- OSPF Router Types 200
- AS External Routes 200
- OSPF Implementation Notes 201
- OSPF interfaces 202
- For example: 203
- Supplying an OSPF ID 205
- Figure 7-2. OSPF ASE Routes 210
- (default) 214
- Setting the Holddown Timer 215
- Configuring Message Logging 216
- Enabling and Disabling OSPF 222
- Configuring an Area ID 223
- Specifying the Network Type 224
- Estimating the Transit Delay 229
- Setting the Hello Interval 231
- Setting the Dead Interval 233
- Specifying the Metric Cost 236
- Specifying the MTU Size 239
- Defining an Area 242
- Modifying an Area ID 244
- Configuring Authentication 244
- Configuring a Summary Route 246
- Configuring a Stub Area 247
- Chapter 8 269
- BGP Concepts and Terminology 270
- Peer-to-Peer Sessions 271
- Interior BGP Routing 272
- IBGP Route Reflector 273
- BGP Updates 274
- BGP Implementation Notes 277
- Configuring BGP Globally 278
- Enabling and Disabling BGP 279
- Supplying a BGP Identifier 281
- Identifying the Local AS 282
- Enabling Multihop Connections 288
- Configuring BGP as a Soloist 291
- Negotiating the BGP Version 301
- Keeping the Connection Alive 303
- Specifying a Holddown Time 307
- Setting the Route Echo Switch 314
- Using Site Manage 330
- (continued) 333
- OSPF/BGP Interaction 343
- Chapter 9 361
- Customizing EGP Services 361
- EGP Concepts and Terminology 362
- EGP Implementation Notes 365
- Customizing EGP on the Router 366
- Supplying a Local AS Number 367
- Configuring a Neighbor 368
- Specifying the Gateway Mode 370
- Choosing the Acquisition Mode 372
- Choosing the Poll Mode 373
- Setting Neighbor Timers 374
- Chapter 10 375
- Security Label Format 376
- Inbound IP Datagrams 378
- Forwarded IP Datagrams 378
- Unlabeled IP Datagrams 379
- Originated IP Datagrams 379
- Enabling and Disabling RIPSO 380
- Outbound Datagrams 388
- Error Datagrams 389
- RIPSO Example 390
- Figure 10-2. RIPSO Example 391
- Chapter 11 393
- BFE Addressing 395
- Chapter 12 403
- Dynamic Address Translation 404
- Static Address Translation 409
- Enabling and Disabling NAT 411
- Configuring the Log Mask 413
- Table 12-2. Log Message Types 414
- Customizing a NAT Interface 417
- Modifying the Interface Type 418
- Adding a Local Address Range 421
- Adding a Global Address Range 424
- IP0076A 429
- Chapter 13 431
- How GRE Tunneling Works 432
- Figure 13-1. GRE Tunneling 433
- Announce Policy 434
- Accept Policy 435
- Static Routes 435
- Deleting a GRE Tunnel 441
- Appendix A 443
- Site Manager Parameters 443
- BGP Global Parameters 444
- BGP-3 Global Parameters 449
- BGP-4 Global Parameters 449
- BGP Peer Parameters 449
- BGP Event Message Parameters 459
- EGP Global Parameters 460
- EGP Neighbor Parameters 462
- IP Parameters 465
- IP Interface Parameters 467
- IP Global Parameters 481
- Static Route Parameters 489
- Adjacent Host Parameters 492
- RIPSO Parameters 495
- Router Discovery Parameters 505
- OSPF Parameters 507
- OSPF Interface Parameters 513
- OSPF Area Parameters 522
- Area Range Parameters 525
- RIP Parameters 530
- NAT Parameters 537
- Appendix B 545
- Routing Policies 545
- IP Announce Policy Parameters 564
- Appendix C 597
- RIP Export Filters 601
- OSPF Import Filters 604
- OSPF Export Filters 605
- BGP-3 Import Filters 608
- 610
- BGP-3 Export Filters 613
- EGP Import Filters 617
- EGP Export Filters 619
- 621
- Appendix D 625
- Route Weight Worksheet 625
- Appendix E 629
- IP/OSPF Configuration 629
- 128.10.6.0 630
- 255.255.255.248 630
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